Jewel Mix.

You can stack your blesses or souls in bundles :
+1 bundle which stacks 10 jewels (Bless or Soul)
+2 bundle which stacks 20 jewels (Bless or Soul)
+3 bundle which stacks 30 jewels (Bless or Soul)
To do this , Go to Devias and Speak with Lahap found at the following coordinates 190/19 .
To disband your jewels , just go back to Lahap and speak with him.
There are two options when speaking to Lahap , either Mixing or Disbanding , nothing else .
P/S : Only Blesses and Souls can be stacked.
Enjoy !